I have a Samsung WEP200. It's small and light in ear (but feels solid), decent battery life (3 hrs speaking) and a fair price tag ($40).

Becareful about any bt headsets you purchase, there are a lot of fake ones being sold online and 3rd party sellers at mall/street/etc.. Many of the stories you hear from people saying "_______ didn't work with my headset" (like button functions or linking) got sold a counterfeit and never knew.